Valve-seat cutter



0 WILLSON AND- E. F. PIWCZYNSKI.

VALVE SEAT CUTTER. APPLICATION FILED DEC-1, 1920.

Patented Apr. 25, 1922.v

I HEEI AW 4 If IN VEN TOR.

WITNESS: 7

ATTORNEY.

I been; WILLSON, or sra'mormnn. AND

ED ARD r. rIwczYNsKi, or HOLYOKE,

' MASSACHUSETTS.

Applicationfiled December 1, 1920. Serial No.'421, 506.

To all whom it may concern:

Be it known that we, OSCAR Wrimsoiv, of

' Springfield, in the county of Hampden and State of Massachusetts, and EnwAan F. PIWCZYNSKI, of Holyoke, in said county and State, both". citizens of the United States of America", have invented anew and-useful- Valve-Seat Cutter, of which the following I is a specification.

Our invention relatesto improvements in manually-operated implements for cutt ng, recuttlng, or 'resurfaclng valve-seats 1n 1nterna-l-combustion engines, and consists es- I accurately resurfaced.

sentially of a stem, spindle, or rod receivable in the valvestem guide ofan internal-combustlon engine, and adapted to be secured to such guide, a cutting element of peculiar construction mounted to rotate on said rod,- and adapted toactonthe valve-seat associ-' ated with said guide, and means'to hold said cutting element .with the cutting edges thereof in contact with such valve-seat, .and to advance or move the same toward saidseat as the latter is-cut away orreduced by the action .of the cutting'parts, so that the latter are maintained in operative position during the cuttin process, togetherwith such sidiary an auxiliary parts and members as may be necessary or desirable in order tot; render the device or implement complete, in every respect, all-as hereinafter set forth.

The primary object of'our invention isto j produce a comparatively simple and inex- ,pensive cutter with which valve-seats inay" be easily, conveniently, expeditiously, and

A further object is to provide an imple ment of "this character 'With removable 7' prolonged.

in whichblades, whereby the life. of said implement is Egolonged indefinitely,- and the blades can reground-and their'life also considerably 'Figure 1 is a side elevation ofa valveseat cutter which embodies a practical form of our invention, saidjcutterbein g shown in ting position; Fig. 2, a centrahvertical section throughsaid cutter, the valve-seatmem- .bers bein present in section" as in the first Specification of Letter s latent. Patented; Apr. 25, 1922.

view, an] Fig. -3, a bottom plan of *the holder for the selves.

Similar numerals refer to' similar partsthroughout'the several views. I

In the first twoviews we show in section a valvesseat 1 atthe top of a casing 2, and a valve-stem guide 3. These or similar elements or members are present in all internal combustion engines, so-that. our applianceis blades and of the blades them I applicable or may bemade applicable to practically any engine of this type, the purpose of the" appliance being to; cut, recut, or"

resurface s'aid' valve-seat 1 valve-seat. i

Thi sffvalve-seat cutter comprises a stem,

spindle, or t which is screw-threaded at its upper terminal, as at.;5,- and at its lower tenulnahflasiatifi, and is provided interme diate of thefscrew-threaded rtions with an annular enlargement 7 to em a shoulder 8, a'bladeholder 9, a, sleeve 10, and. a plural;

. or, any similar:

ity of nuts and washers, as will presently more clearly appear. The part of the rod '4 thatv is above the enlargement 7 is? larger] below said enlargement;

in diameter than that part of said rod that is (as, Therod leis adapted to have'its lower 4 portion-inserted in thevalve-stem guide3.

from above as far as the shoulder8,.which is on the bottom of the enlargement. 7," will permit, the latter then rest ng ongtop of said guide. When the rod 4 isin place in the guide 3, with the shoulder"8 bearing on the upper edge-of said guide, said rod extends some distance below the bottom edge of said his. 1 The rod 4 is secured to the guide 3. y ,means of a nutllgand a checknut" 12 on the-threaded part 6 of said rod, with whatever number off'washers, as 13, 1f.4, and 15, may beneeded to locate said nuts near the bottom end of the. rod when ,said

nuts'are tightened. Without the aforesaid Washers, it would be necessaryto provide a longer screw-thread on the lower. terminal portionof the rod 4, and to consume very much more time insecurin said rod} to the. guide 3 and in releasing it t erefrom, unless said 'dewere of unusual length, or the part of the rod below the shoulder 8 were much. shorter, as will readily be "seen; The washers operative relation to a valve-seat and in cut- 13, 14, and 15 are of difl'erent widths or Its lengths, and all are not required when the guide? is longer than in the present case. As a matter of fact, any number of washers maybe provided, and they may vary in widths and lengths to whatever-extent ma be desired, the only'requirement being, course to provide the necessa filling ele 'mentor elements between the ottom edge of the guide 3 and the upper surface of the nut'11. a The holder 9, isrigidly affixed to the base of a hollow stem or sleeve 17 whichis looselyv mounted 'on the rod 4, and said holder is a equipped with four blades 18. Said, holder extends in opposite direction from the vertii cal center thereof, and in such extensions or arms are four slots 19 to receive the blades y 18, there being two such slots in each of said arms. The-slots 19in opposite pairs are in 2 ofiset relationship, soas to locate the blades 18 out'of line with each other and thus preventchattering. -Each pair o-fblades 18'is held in place by ineans of a taper pin 20,- which pinpasses throughvone arm of the holder 9, and through said blades, transversely. Upon removing the pins 20, the blades 18 can be taken from the holder 9 for. the purpose of being, reground, or in order that they may be replaced with others.

'Tlie}'blades 18 have obliquecutting edges, the angle of which corresponds with that of the valve-seat 1. The sleeve 17 has flattened parts on opposite sides thereof, one such part appearing at'21 in Fig. 1, for the application of a wrench or other tool or implement by means of which said sleeve and the holder 9 with its blades 8 are rotated during the cutting operation. v

The sleeve 10 has a longitudinal slot 22 therein, into which slot a pin 23 projects from the rod 4. Thus the sleeve 10 is er- .mitted a limited amount. of longitu inal melvement, but held against rotation on the f ro 4.

One or more washers, as 24 and 25, are placed on the rod 4 between adjacent ends of the sleeves 17 and 10, and there is anut 26 on the screw-threaded portion 5 of said rod above said sleevev 1 0.

The washers 24 and are for similar, purposes as are the washers 13, 14, and 15, that is to say, they are spacefillers between the sleeves 17 and 10, and may vary in nu1nher and thickness or length, as in the other case, such-factors being governed by the distance from the horizontal plane of the valveseat 1 to the bottom of the sleeve 10, when said sleeve is raised on the rod 4 as far as the pin 23-will permit, or,'in any event, located with the top of the slot22 some distance above said pin. r if all valve-seat'casings and valve-stem guldes were of'the same length, re ectively and ,relat1vely, our'ap liance coulr l be conit Stun ed so that it wou d not be necessary to In practice, assuming that the blades 18 provide any space-filling memloers at ends, but such not being the'case, and inasmuch as itiis desired to construct said ap-- pliance so that it ,is applicable to a great variety of valve-seat members, the appliance is made long enough to accommodate valveseat casings and valve-stem guides of maximum lengths, and adapted to such members when under or less than the maximum, as we have shown, provided the washers of which, mentionhas been made, eithe r the identical washers shown inthe drawings or others, according to the requirements in any othergiven example, be-furnished and used.

be in place in the holder 9, the application and operation of the valve-seat cutter "is described as follows: A

1 While the rod 4 is denuded of the nuts j and washers at the bottom, said rod is intro- 35 duced into the top of the valve-stem guide 3 andlpasse downwardly through said guide until the shoulder 8 comes to rest on the top of the guide". I Next the'washers 13, 14,- and 15, areslipped up onto the rod 4 from below, and the nut-11 is screwed on to said rod beneath said washers and tightened thereon until the guide 3 is gripped tightly between the shoulder 8 and the washer 13, so that said rod is held securely in place in said guide. Then the check-nut 12 is screwed on to the terminal 6 of the rod 4 against the under side of the nut 11.

While thenut 26 and the sleeve 1Q are off of the rod 4, it first being necessary to remove the pin23 before said sleeve can be removed from said rod, the sleeve 17 is passed on over the top of the rod and downwardly thereon until' the cutting edges of the blad'es 18 come to rest on the valve-seat 1. The washers 25 and 24"are then placed on the rod 4 on top of the holder sleeve 17, and t the sleeve 10 is placed on said rod over said last named washer and there secured, within the range of movement permitted bythe slot 22, by means of the pin 23 which is replaced in-the rod. Finally the nut 26 is screwed on to d 4. -A suitable 1nstrument,as a wrench, is now the threaded terminal 5 of the applied to the sleeve 17 and said sleev with the holder 9 and the blades 18 is rotated, with the result that the valve-seat 1 is cut away by said blades. I As the valve-seat 1 is cut away the nut 26 is screwed down to is maintained throughout the resurfacing operation. The vertlcal movement of the parts during the resurfacing operations is, of course, comparatively slight, and ample provision is made for the same by the slot 22. The sleeve 17 is free to revolve on the spindle under a force suflicient to overcome the frictional resistance offered thereto by the sleeve 10 and the valve-seat 1, when said sleeve 10 is forcibly contacted with by the nut 26, and the same is true of'the washers 24 and 25.

After 'the' valve-seat 1 has been cut, the check-nut 12 and the nut 11 are unscrewed from the terminal 6, the washers above said nut are removed from the rod at, and the latter is withd awn in an upwardly direction from the guide 3 without removing the part-s carried by said rod above the enlargelargement 7, except for the purpose of introducing washers between the sleeves 10 "and 'when the appliance is in operative position,

to enable the cutting parts to move downwardly on the rod 4 to the extent required for the proper cutting of the valve-seat, con-- sequently the part or parts above the sleeve. 17 must be proportionedwith such end in view.

When the blades 18 become dull, or if for any reason it is desired to take said blades from the holder 9, it-is a very simple matter to drive out the pins 20 and remove the blades from said holder, so that the blades can be sharpened, or replaced with others; and it is an equally simple'matter to return the resharpened or supply newblades to the holder and resecure them with said pins. In many, not to say most, cases, the bladescan, if preferred, be sharpened without removing them from the holder.

More or less change in the size, shape, construction, and arrangement of some or all of the parts of this appliance may be made without departing from the spirit of our invention or exceeding the scope of what is claimed.

What we claim by our invention, and desire to secure'by Letters Patent, is

l. The combination, in a valve-seat cutter, with a rod receivable in a valve-stem guide, and having an integral shouldered means on said rod to retain said cutting means in engagement with a valve-seat.

" 2. The combination, in a valve-seat cutter, with a rod receivable in a valve-stem guide, and having an integral shouldered part to bear 011 said guide, and means on said rod to bear against the bottom of said guide and cooperated with said shouldered part to secure the rod to the uide, of a shouldered sleeve mounted to slide and rotate on said rod'above said shouldered part,

cutting members mounted on and fixed to said sleeve below the shoulder thereon, and

means on said rod to forcesaid sleeve and cutting members toward a valve-seat.

3. The combination, in a" 'valve-seat cutter, with a rod receivable in a valve-stem guide, and having a shouldered part to bear on said guide, and engaging means on said rod for the bottom of such guide, which engaging means cooperates with said shouldered part to secure the rod 'to the guide, of ,cutting members mounted to rotate on the rod above said shouldered part, and means to, actuate said cutting members toward a valve-seat, said last-named means consisting'in part of a slotted sleeve on the rod, and of a nut threaded to said rod above said sleeve, the rod having a pin extending into the slotin said sleeve.

4. .The combination, in a valve-seat cutter, with a rod receivable in a valve-stem guide, and having a shouldered part to bear on said guide, and means on said rod to bear on the bottom of said guide and cooperate with said shouldered partto secure said rod to the guide, of a sleeve mounted to slide and rotate on the rod above said shouldered part, and provided with a holder which is affixed thereto,'blades carried by said holder, and means to retain said blades in contact with the valve-seat as they cut away the-surface of the same.

OSGAR iQ E WILLSON.

mat

Witnesses:

A. C. FAIRBANKS, F. A. Curran. 

